Thanks man, if you were checking 'Unleashed' I have to say I havent a clue what key it's in or what scales I used. I made that one up entirely by ear.
If it's 'Contact' you're talking about (the one at the beginning of the thread & in my sig file), as far as I know I used variations of the Algerian, Harmonic Minor and Id scales. I found them on Dan Kellers website and played them once or twice and they ended up steering the direction of the lead, I'm pretty sure I changed the Id scale to something else but whatever it is it seems to work.
I really know nothing about theory, I just play what comes to mind - if I try thinking about theory it kills my creativity... sorry I can't help much on that front!